Process of producing discharge effects on colored grounds.



5 FEIQE.

BERTI-IOLD WUTI-I, OF BASED, SWITZERLAND, ASSIGNOR TO SOCIETY OF CHEMICAL INDUSTRY IN BASLE, OF BASED, SWITZERLAND.

PROCESS OF PRODUCING DISCHARGE EFFECTS ON COLORED GROUNDS.

No Drawing.

To all whom it may concern:

Be it known that I, BERTHOLD l/VUTH, doctor of philosophy, chemist, a subject of the King of Great Britain, and resident of Basel, Switzerland, have invented a new Process of Producing Discharge Effects on Colored Grounds, of which the following is a full, clear, and exact specification.

This invention makes use of the fact that organic ammonium compounds in presence of alkali have a decomposing action on the majority of organic dyestuffs. This is especially the case at higher temperatures and this behavior of the organic ammonium compounds can be applied in a suitable manner for white or variegated discharge effects on colored grounds. If dyed cotton be printed with a mixture of alkali and an organic ammonium compound, such as dimethylphenylbenzylammonium chlorid and afterward steamed, a white discharge effect is produced on the dyed goods. If the alkaline discharge be mixed with a dyestuif adapted to withstand the decomposing effect of the organic ammonium compound, variegated discharge eifects can be obtained. By application of the invention pure white discharges can be produced on light and medium dyeings without any other addition and without subsequent treatment. For discharge eifects on dark dyed grounds an ad.- dition of glucose is to be recommended.

The application of organic ammonium compounds in connection with discharges for colored grounds has been already proposed, but not their application alone; it has merely been suggested that they should be added to printing colors which contain formaldehyde sulfoxylate in order to increase the discharging action of the latter. (See Austrian patent specification No. 28437, dated March 15, 1906.) From this known method of discharging the invention differs in that the discharging effect is due solely to the ammonium compound in complete absence of other discharging substances (such as hydrosulfite preparations). Particularly good results are obtained by using dimethylphenylbenzylammonium chlorid, although other organic ammonium compounds may be used, such as trimethylphenylammonium chlorid, a tetra-alkylammonium chlorid or trimethylbenzylammonium chlorid, also such Specification of Letters Patent.

Application filed April 13, 1910.

Patented A11 8, 1911.

Serial No. 555,188.

ammonium compounds as are themselves dyestufis, such as brilliant phosphin 5 G, methyl green and the like.

The method may be applied to very different colored ground, but it is especially applicable to white and variegated discharge effects on dyeings obtained with vat dyestuffs.

The following examples illustrate the in vention.

Example 1: For a white discharge, the fabric dyed with indigo, ciba violet, ciba gray, helindon, orange or thio-indigo red, is printed with the following mixture:

of gum solution (1:1).

dimethylphenylbenzylammonium chlorid.

caustic soda lye of 40 B.

specific gravity.

300 grams 100 After printing and drying, the goods are steamed for 5 minutes in the Mather-P1att apparatus and then washed.

Example 2: For a red discharge, the fabric dyed with ciba blue 2 B or indigo M L B/6 B, is printed with the following discharge mixture:

650 grams of gum solution (1:1).

150 printing chrome red.

100 dimethylphenylbenzylammonium chlorid.

100 caustic soda lye of 40 B.

specific gravity.

After printing and drying the treatment is the same as described in Example 1.

formed by a mixture of equal parts by weight of chrome acetate of 20 B. and of soda lye of 40 Be.

gated discharge effects on colored grounds,

600 grams of gum solution (1:1).

cent. strength.

What I claim is: A process of producing White and varieconsisting in applying to the fabric an alkaline printing mixture containing a discharging agent consisting solely of an organic ammonium compound substantially as described.

In Witness whereof I have hereunto signed my name this 14th day of March, 1910, in the presence of tWo subscribing Witnesses.

BERTHOLD WUTH.

Witnesses: c c

GEORGE GIFFORD, AMAND BITTER.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

